{ "item_title" : "The Principles of Mr. Harrison's Time Keeper", "item_author" : [" John Harrison", "Nevil Maskelyne "], "item_description" : "The Principles of Mr. Harrison's Time Keeper: With Plates of the Same is a book written by John Harrison and published in 1767. The book is a detailed account of the principles behind Harrison's invention of a highly accurate marine chronometer, which was used to determine longitude at sea. The chronometer was a significant breakthrough in navigation, as it allowed sailors to accurately calculate their position at sea and avoid dangerous collisions with rocks and other hazards. The book includes detailed descriptions of the construction and operation of the chronometer, as well as illustrations and diagrams to help readers understand the principles behind it. Overall, The Principles of Mr. Harrison's Time Keeper is a valuable historical document that sheds light on one of the most important inventions in the history of navigation.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/1/16/191/812/1161918124_b.jpg", "price_data" : { "retail_price" : "32.95", "online_price" : "32.95", "our_price" : "32.95", "club_price" : "32.95", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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